Hi Amy, and welcome to the Forum and to iSecretShop!
I would suggest going to www.iSSprep.com, and completing the free courses there - they will explain the iSecretShop platform, the mobile app, and the various features you can take advantage of. They will also award you shopper points, boosting your rank.
After that, you can check out the following thread: https://www.secretshopforum.com/thread/1/2/94/pro-tips-for-those-who-want-to-be-the-best-shoppers#post528
There's a bunch of tips & tricks there that can be helpful.