The software does have a learning curve. The first thing to focus on is to customize an equipment profile to match your system. Since you should have some experience from Brewers Friend to go on, estimating the total efficiency (Brew House Efficiency) will be easier for you than coming in cold.
After that, tackling the recipes and having them come out for you is pretty easy. Since you have a recipe already entered, you can change, modify, or add anything that you want to that recipe. Nothing is etched in stone until you want it to be. When you want to brew a recipe, you can click on the recipe name and click on 'copy to log' on the toolbar. This will place a copy of the recipe into a folder called 'brew log' and you can use this copy to enter brew day notes and readings. It makes a good archival system for recipes, especially if you are fond of upgrading equipment or tweaking recipes as you develop them.
When you get to brewing one of your recipes, keep good notes on the volumes and gravity readings throughout the process. Using the 'session' tab, enter the measured values versus the projected values and for the first brew, don't fret over the numbers matching exactly. Take these readings and you can calculate out the grain absorption, boil off rate, mash tun and kettle losses to trub, etc. Use these values to update your equipment profile to get the software to match your system even better. There is much in the software that you can customize from a process standpoint.