Reports are can be found in the RPM (Report Menu).

The reports are sorted by modules. 
The Personal Menu lists the reports that you have added to your personal report menu.

Click on the preferred module name and you will get an overview of the reports sorted by sub modules. 
The numbers to the right show the quantity of reports linked to the specific modules/sub modules. 
You may click on the numbers to display all the reports connected to this module.

In the REP menu, you can choose the module & sub modules from the drop-down, and find the report based on name and description. 

There is another option too: Write REP in the program field, followed by a space an then a star ‘*’ and what you are searching for as in this example:
REP *Stock
This lists all reports where ‘STOCK’ is mentioned in the name or description.