Direct deposit help

Searching: "Hey I need to change my direct deposit before I mail off my amendment but I won't be around a computer after now...can someone email me telling me how? I've stayed at my moms two days trying to get this figured out around a computer...but I can't stay anymore. I need this to get done badly, but nobody called when I asked...I spent 300 dollars I had to borrow...still can't figure out how...and haven't gotten anything done...still have 3 years tied up in a confused mess. I have the app on my phone so I'm hoping the rest I can handle with that. Please someone get hold of me and lemme know. Thanks.