Hi jennileewilliams
You have to click the upper part named vacany search on that web page...then a search window appears. You type in cabin crew in the last box and click search...you should come up with two choices LGW permanent or LHR temporary 6 mths. Click the one that suites you better and proceed to the bottom of the page where you click apply button. Of course reading everything on that page.
That should bring you to your on-line application.
Good Luck
PM me if you still can't do it. Will be happy to help when I find some time
Kind regards
L.