Hello Riana,
I assume that you don’t have an attribute such as ‘text’ or ‘aaname’ in the selector, or you can type into the name of the variant?
Maybe you have an option to search for the value in the catalogue?
Eventually, you could try to find the row with proper variant before clicking by iterating through the table and checking if the current UiElement has the variant you’re looking for in one of the attributes (the onse you cannot add in the selector - from Property Explorer tab in the UiExplorer Window).
It would be easier to help if you shared screenshots of the UiExplorer Window with selector details and of the view of the catalogue. 