printing a score after changing Key

I am brand new to musescore and there is a score that I want to print but need to transpose it first. When I transpose it in the app on my iphone, I do not see the option to "download" it. So I thought I'll just share it to my email and then print it, but it goes back to the original key. I'm assuming that if i could get it on my computer that I'd be able to transpose and then download/print, but apparently the app is not compatible with my macbook (just posted that question as well separately).

Any suggestions on how to make that work for me.

Here's the file I'm trying to transpose up a minor 3rd https://musescore.com/user/5962436/scores/1505916?share=copy_link

Thank you for your help!

Thank you