Sorry, GarageSale Touch for iOS does not have such a function.
Also, it is not compatible with all the changes of the eBay system.
We had to remove GarageSale Touch from the App Store because the current version can’t start listings that are compliant to eBay’s new policies.
In GarageSale for Mac it might also be needed to check the footer and if you use a design form the Design Store, update it. Please see #2 in the FAQs here for all details: