Press Ctrl + L, which will bring up the log in prompt. If you have cached details (from telling BYOND previously to remember you), you can then press log in.
I chose a bad time to uninstall and reinstall BYOND…
Thanks for the tips, though, Harry! I haven’t been able to satify my SS13 cravings for weeks now… the withdrawals are kicking in hard.
Edit: Just tried this, and it works! Sadly, because I uninstalled and reinstalled BYOND, I am stuck as a guest and not allowed in any of the SS13 servers I usually play. This is literally 1984…