PC is a preference, not a requirement. We had both running when he arrived and asked which he preferred. He had only used a PC before.
I'm assuming it's just open strava.com, hit "manual upload" and select the file from the connected Garmin.
If he's not already, if someone gently points Steve towards how to do all this via a
Chrome Incognito window (or IE/Safari's private browsing or whatever) and then close it when all done, this could really pay off over a whole year of promiscuous PC usage.
(Last week guest used my laptop for facebook when I wasn't looking, and then when I went to do Strava stuff I was doing so on their account without realizing it for a while. I'd *really hate* for this to happen to Steve, as worst case tracks maybe deleted, or junk uploaded and the legitimacy of the entire account called into question. On one hand I'm panicking over nothing, but otoh I've seen even sillier errors happen when sleep deprived).