Launch different debian backaches on debian interface

Hi,I was wondering how can I run installed applications on debian interface with x11 launcher that are not located in the applications. To be more specific I have installed snap store and I found viber.deb for arm64 devices like raspberry pi 4b but although I installed it properly and got the confirmation line on terminal that it is installed , it’s nowhere to be found. Any solutions ? Thank you all for your time. Keep up the amazing work

You would probably run something like whereis viber to find the application and launch it manually from the shell.

Should I type this on the "run: section or the terminal? I am a rookie so I would appreciate some help here. Thank you in advance