First set up a ko-fi account:

https://medium.com/curation-matters/a-guide-to-setting-up-ko-fi-how-to-set-up-a-ko-fi-page-54c4ad9efa48

Then go to Settings - Publishing - Manage tipping and go from there. You can do this! I'm sure there is a way to set up your ko-fi page so there can be an adoption thing. But even if you just leave it as is . . .people could send a note with payment and the name of the guinea pig they want to adopt. 😊😊😊