Help with aspect ratio please · Poster Print on Demand

Help with aspect ratio please

So sorry to ask again, having a nightmare with midjourney! I am trying to edit some images I have created but stupidly created in the wrong aspect ratio. I have found the edit section where i can change the aspect ratio but it will not let me change it to ar90:77, it keeps fomatting to a complete different ratio! I am hoping I wont have to start from scratch. Again, any help appreciated, any easy way to get my image into the ar90:77 size would be great, thanks in advance.

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