[OSM-newbies] JOSM instructions

[James Ewen]

Once again, I am making a stab at using JOSM versus Potlatch. Once
again, I can not figure out how to use JOSM to sketch roadways over
Yahoo imagery.

I have 4 layers, unnamed, Yahoo, Slippy Map, and Validation errors.

I can move between the layers (Slippy Map is blank), but is there a
way to get the unnamed layer to be visible on top of the Yahoo layer,
similar to Potlatch, or do I need to flip back and forth between the
two layers?

What's the Slippy Map layer all about?

James