AppData is hidden by default, to go there it's either you:
1. Do it manually using your mouse by clicking Windows > your username (in the upper right corner). A folder/windows explorer will open. On the navigation above > click Organize (dropdown menu) > click Folder and search options > go to View > click the radio button for "Show hidden files, folders, and drives > click Apply > click OK . It will then show the AppData folder for good unless the settings was reset to default.
2. Do it in an easy way using the shortcut keys. Using your keyboard, hold windows button and press R > put %appdata% and press enter. That's it, you'll be directed to AppData/Roaming folder. This is an easy way to access the folder while it remains hidden
3. The link can be given to you, you just need to change the username, but I prefer not for you to learn too so that next time you can go to that folder without looking for the direct link.
By the way, have you looked here: https://www.bitcoinarmory.com/troubleshooting/ - just disregard this as HCP said