To use this userbox on your user page, just copy and paste the following script: ((User:Skittleys/Userboxes/Friendly))
When used as is, the tag that appears is ((COI)). However, you can also specify which tag you want to use! To do so, add the following code to your user page, replacing tag-name-here with the template name of your choice: ((User:Skittleys/Userboxes/Friendly|tag=tag-name-here)).
For example, if you use the ((cleanup)) tag a lot, you could add ((User:Skittleys/Userboxes/Friendly|tag=cleanup)) to get the following userbox: