in the module:  Extend Your Reporting Strategy with AppExchange.  I launched my trailhead, went to settings, opened app exchange, picked an app, selected "get it now", then was presented with screen saying I needed to log in.  I clicked something like "open log-in screen" and get a spinning wheel.  Have tried different scenarios of this, inluding opening in new tab, but nothing works.  I may get a log-in opportunity by opening in new tab, but when I do, it doesn't recognize my login credentials.  I click "reset password" and it never emails me.

in the module:  Extend Your Reporting Strategy with AppExchange.  I launched my trailhead, went to settings, opened app exchange, picked an app, selected "get it now", then was presented with screen saying I needed to log in.  I clicked something like "open log-in screen" and get a spinning wheel.  Have tried different scenarios of this, inluding opening in new tab, but nothing works.  I may get a log-in opportunity by opening in new tab, but when I do, it doesn't recognize my login credentials.  I click "reset password" and it never emails me.