First download Remote File Manager Free from the App Store.
From the Dashboard click the + icon in the top right
Then select the first link, Network Share
The Computer Name/IP will be provided to you by Simplifying IT.
Make sure the Port is set to 445
Enter your User Name, which is the same as the user name you use to log into your remote desktop server, and will be provided to you also.
Enter your Password as provided to you. Your User Name should already be pre-filled.
You should be able to see a list of the files and access them now.