This is the very first thing you should do within your Engager account, so take your time as leaving things out can impact other areas of your Engager account
Head to Default Terms and Privacy and start completing each section, one by one.
Enter number of days your policy gives to respond to data protection requests - I would give yourself plenty of time for these, probably 30 days!
Enter number of years your store data

Select all software's and places you use so that the privacy policy reflects the correct softwares

If something you use isn't on the list add it using the Add New Option

Click on Save