Follow below mentioned steps to get your private vimeo app access token:
Step 1: Go to https://developer.vimeo.com/apps/
Step 2: If you have an account on vimeo then login, self create a new vimeo account
Step 3: If you have already created an app then follow the procedure from Step 5, else follow step 4 to create a new app
Option Step 4.1: Provide the required info, check I agree checkbox and click on Create App button.
Step 5: Click on Authenticate tab
Step 6: Click on Generate Token button
Step 7: Copy access token and paste it in Appy Pie