Polylang issue

Hi, new problem with polylang. I need to translate a few things of my theme (hueman) and I have two problems.

1. Evrytime I try to change a translation in strings, backend, polylang, I click save and it takes me to Page not found (and it doesnt save it).

2. I need to change 4 things that are not there, how can I add strings? I search and search and cnat find the answer anywhere…

Thanks!