Step1: Go to G-suite market place and search for Fillable Document or Click here and click on it.

Step 2: You will get installation window. click on INSTALL

Step 3: Fillable Document will ask your permission to install. Click CONTINUE

Step 4: It will take you to the Authentication window and select your account

Step 5: click Allow that will complete your Authentication process.

Step 6 : Finally click on Done. That Completes your Installation process.

Step 7: Now your Fillable Document is ready to use.