As a reminder, be sure to properly give content warnings and put sensitive subjects behind proper spoiler tags. It's for the mental health of not just your comrades, but yourself as well.
Here is a screenshot of where to find the spoiler button.
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I would advise you to use she/her as your pronouns if that's exclusively what you want people to use! Pronouns are weird, gender is a fuck, if you feel better about having a they/them on there that's understandable.
Try it out for a couple days and see how it makes you feel. If it's just too much anxiety, that's okay. You're allowed to use whatever pronouns you want to.