How to write characters like ë é è

Hi, first time here so please don’t bite my head off if this appears to be a topic that as already been solved. I couldn’t find anything though.

How can I write special characters like ë é è etc? When I try this now it sometimes works, but more often it doesn’t and I get "e 'e `e etc. I’ve tried changing keyboard but to no avail.

I am using a HP Chromebook and the AnkiDroid app 2.14.

Many thanks, hope you can help me out.