How do I get wrinkles out of my shirt if I don’t have an iron available?
Hang it up in the bathroom during your morning shower; the steam will relax the fibers, which should eliminate (or at least soften) the wrinkles.
Boil a pot of water on the stove, and press your shirt with the pot’s shiny metal bottom ?
I’m in a dorm room with community showers, and not boiling water… anything else?
Dampen it and put it in a dryer. Take it out as soon as its done.
Get some of that Wrinkle Releaser stuff.
That’ll work.
And take shirts out of the dryer as soon as they’re done and hang them up, if possible. Also, shake them out when you take them out of the washer, before you dry them.
Peace,
Heloise I mean mangeorge 
I use a hair dryer. Just blow the hot air on the shirt keeping some tension on the fabric and viola!, no wrinkles. This method can even be used while you’re still wearing the shirt! You can scorch the fabric this way if you leave the hot air on it too long so be careful.