Just tell me the name of the bundleid for the Wells fargo app and I will include it in an update.
For future reference though. If you I post an icon and you want to use it in the theme you already have on your phone.
All you need to do is, rename the icon you want to use with the bundleid name plus @2x or @3x. It should look something like this:
com.appname.something@3x.png. Take that icon that you just named and place it in the folder "Iconbundles" which is in the root of the theme folder.
You can use iFile. The settings icon names usually have the same naming convention as the app's icon. For example:
AppIcon60x60@3x.png for the icon and
AppIcon40x40@3x.png. it is usually that one.