Filters
DNS Blocklists
Click "Add blocklist"
Click "Choose from the list"
Check the box in front of "OISD Blocklist Full"
Click "Save"
(Note: "OISD Blocklist Full" already includes all domains from "OISD Blocklist Basic", thus you won't need to enable that one)

Click "Adlists"
Where it says: "Add a new adlist" in the input field under "Address" enter https://dbl.oisd.nl
Click "Add"

Click "Settings"
Click "Blocking"
Where it says: "Block List URLs" click the box/field below "Quick Add" and select "OISD Block List by sjhgvr"
Click "Save Settings" at the bottom.

Settings
DNS Filtering
DNS requests blocking
+ NEW DNS FILTER
Where it says "URL or Path" enter https://abp.oisd.nl/basic/
Tap IMPORT
Where it says "Enter DNS Filter Name" enter "oisd basic" (without quotes)
Tap ADD

Settings ("Cog"-icon in the bottom) (Might need a second tap to actually go to settings page)
General
Enable "Advanced mode"
Go back to settings ("Cog"-icon in the bottom)
DNS Protection
Enable (if not already enabled)
Toggle OFF to ON
Tap OK then Allow to install a local VPN profile
DNS Filtering
DNS Filters
Add a filter
Enter filter URL: https://abp.oisd.nl/basic/
Tap ADD

Tap the middle block where it says "# up-to-date sources"
Tap the plus sign in the bottom right
Where it says "Label" enter: "oisd basic" (without quotes)
Where it says "Location" enter: https://hosts.oisd.nl/basic/
Tap the checkmark in the top right
Tap "Apply" in the bottom right

Tap on "HOSTS"
Tap the plus sign in the bottom right
Where it says "Title" enter: "oisd basic" (without quotes)
Where it says "Location" enter: https://dbl.oisd.nl/basic/
Tap the checkmark in the top right

Enabled by default :)

NOTE: oisd is domain blocklist, not a content-filter-list. It is therefore NOT a replacement for the default filters of uBlock, so leave those enabled!

Left-click the uBlock Origin icon in your browser
Click the "Cogs"-icon (opens the dashboard)
On "Filterlists"-page, scroll down and tick the box where it says: "Import"
Where it says; "One URL per line. Invalid URLs will be silently ignored.", type: https://abp.oisd.nl/
In the top click on "Apply Changes".

Find the Adguard Browser Extension icon in your browser, and click it
Click the Cog-icon in the top right (Adguard Settings)
On the left, click "Filters"
At the bottom, click "Custom"
Click "Add custom filter"
Where it says "Enter URL or file path" enter: https://abp.oisd.nl/
Click "Next"
Click "Subscribe"

Open your configuration screen ( https://my.nextdns.io )
Click tab "Privacy"
Under "Blocklists" click the button "ADD A BLOCKLIST"
Scroll till you find "oisd" and click on "ADD" to the right of it

Go to Server Settings > Blocklists
Click "Manage Blocklists"
Check the box in front of "OISD Blocklist Full"

Free
Go to https://controld.com/free-dns/
Scroll down to "OISD - Full"
Behind that click "Configure" then "Setup Guide" and follow instructions

Paid users enable oisd here:
Go to Filters (https://controld.com/control-panel/filters)
Click "3rd Party Filters"
Enable "OISD – Full"

Open the custom filter page ( https://dnswarden.com/customfilter.html )
Scroll till you find "oisd basic/full/nsfw" and enable the ones you want.

Setup guide here

Open your configuration page ( https://rethinkdns.com/configure )
Scroll till you find "OISD FULL" and click on "ADD" to the right of it