Sirius programming presets

When I got my Prius, I activated my Sirius radio with some of the presets I was used to. I cant figure out now how to scroll through the stations one by one in order. Sounds kind of lame, I know. There was no instruction manual with this unit which ticks me off, and Sirius cant provide one. I dont know who made the radio either. I would like to search or "seek" for blues channels, but it doesnt scroll thru the generas (speling?) of music. I may need to call Sirius for help, but I thought I would try here for some assistance. Thanks for any input.