For anyone that needs help, some steps were left out,

  1. Navigate to your environment.
  2. Click Gear Icon at the Top
  3. Select Advance settings
  4. Click Settings, choose Customizations
  5. Choose Customize the System
  6. Choose Process from the navigation tree
  7. Open the Workflow which you have created
  8. Copy the URL and Get only GUID from there.

Alternatively,

Choose Solutions from  the left NAV in Power Apps

Choose the Default Solution

choose Processes form the nav tree

Edit the workflow

copy the URL