Anyone know how to upload pictures of the covers of manga into an album?

click on the manga you want
>
left hand side you should see a white flag
>
click on "The manga info (e.g: cover, author) is wrong
>
write down the basic details like "[name of manga] cover should be changed to this [link the cover image]"

wait no, misunderstood what you wanted! i don't know any way, but you can go on google and save the image you want. go to your album, click "add photo" and pick from your device

Thanks