Login to your YouTube account, and head over to your channel home.
Click on the "Customize Channel" button at the right top corner.
3. Scroll down and click on the "Add" button in the links section.
4. Add a name by which you want your link to be displayed.
5. Enter your Buy Me A Coffee page URL in the URL section.
6. Click on done.
Your Buy Me A Coffee button will now appear in the about section of your channel. 🎉
Do check out this video to see the whole process in detail. 🥤