Accounts in Mod Advisor can be easily created in two ways.
Import a bureau report and the account will automatically be created.
Navigate to Manage Accounts on the left menu which will take you to the Accounts Screen
Click the + sign located in the top right green header.
A pop up will appear for the entry of information on the new account
Complete the information and select Save.
After your account is created you'll probably need to search for it to go into that account and then you can create the mod file.
Here is a video.