This board contains topics for all the approved themes that are submitted in the theme site (https://custom.simplemachines.org/themes/).
If you are using a custom theme, you should first ask for support in the topic for that theme before asking elsewhere. Remember that theme authors may not always have the time to help you, so be considerate. Topics that have been locked are from themes no longer available in the theme site.
If you want to submit your own themes, please look at the submission guidelines (https://www.simplemachines.org/community/index.php?topic=561128.0)!