I can't make a suitable xpath query

Question

selenium

It is necessary to refer to the element that is above the selected one (to click on the tab). At least that's how I understand it. It is nested in "mainFrame". If you just write an xpath type request //*[@id="iconSea"]/li[14]/a, nothing happens. I don't know if I should find and "click" on mainFrame in advance (I tried to do that, but still didn't get the desired result). I have no idea how to write a full request. I would appreciate a detailed answer. ps already where I could - I read, looked, and as a result, there were only errors in the output ... // Perhaps it is necessary to register each expanded tab ... I don’t understand if the webdriver works like this ...