This isn't a TubeBuddy question but a more general YouTube question so thread moved.
You can get superchat donations once you are monetised as above, or you can go with paypal in you description. Some channels have seen some success by going with "BuyMeACoffee" (google it to learn more) those are the best ways to allow donations.
I wouldn't put too much into ASKING for donations however because socially that's seen as begging and poor form. Vyyyper live did it the best, an hour into his streams he'd mention it quickly for a few seconds and left it at that.
I personally find it worrying when people only do YouTube for money, and generally the quality of the content reflects that.