Not able to edit application

I applied to various jobs few weeks ago and now that companies are hiring again.
In meantime, I have gained some new skills like Java and .net but I am not able to edit my application. How can I add these things in my application as I wasn’t called for interview by these companies before.
Please help. It will really be appreciated.
Thank you.

If its locked, then you can’t edit.
But you can upload your updated resume. Resume is what your interview will be based on.

I have updated it already but as you know when we apply, companies ask us to upload our resume and thus I can’t edit that resume.
Doesn’t that matter?