The full manual is under construction... here's the tl;dr version (which is all you really need):
Entrian Inline Watch is supplied as a "VSIX" file. This is Microsoft's native format for Visual Studio extensions. Just run the VSIX in order to install it. To uninstall, use the "Tools / Extensions and Updates" command within Visual Studio.
Once installed, Entrian Inline Watch will display your variables' values inline in our code as you debug.
Entrian Inline Watch adds two commands to your Tools menu:
The "Toggle display" command switches it off and on. The "Configuration..." command shows the configuration dialog, from which you can:
BankAccountobject can display as, for instance, Bob: $123
account->balance()can display as $123