In screens.rpy you need to find screen main_menu():
and add somewhere within something like the following.
Code:
screen main_menu():
#### OTHER SCREEN CODE
imagebutton:
idle "AnImageWhenTheMouseIsn'tOverIt.EXT"
hover "AnImageWhenTheMouseIsHoveringOverIt.EXT"
action OpenURL("http://yoururlhere")
xalign 0.99
yalign 0.99
At minimum you need 1 image for this to work and have it as the 'idle' image, hover is only if you want to have the image change when you mouse over the image.
The current xalign and yalign values will place the button in the bottom right corner.
You can read up more on screen language in the Ren'py Documentation on
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