For information on preparations to get to this step checkout the How do I redeem my Ada? section.
If you didn't manually went through the vending process via the AVVM and then get your vending certificate recovered via Recovery Service, then this is the kind of vending certificate you have.
- Enter the Recovery - force vended tab
- Select the wallet you want to redeem to and enter the password
- Uploaded the vending certificate via the Click to upload box
- Enter the passphrase the pop-up dialog
- Click the Redeem your Ada button on the bottom