I've lost track of which 15 version of PPM re-introduced users accessing 'Reports' from 'Reports and Jobs' and only having access to Advance Reports.
If you can see 'Reports and Jobs' from the Home menu, then undertake the following steps:
Administration / Data Administration / Reports and Jobs
Filter by required Report in the 'Job Definition Name' - and click on required item
There will be a Parameter Tab, where you can modify the Parameter including Default value
If you don't see 'Reports and Jobs', then upgrade .