Hello @Maraciuca,
Please do next steps:
1/ Submit new own topic here – https://www.8theme.com/forums/xstore-wordpress-support-forum/
2/ Provide temporary wp-admin access, so we can take a closer look at your settings.
Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
3/ Provide an example or video of what exactly changes can’t be saved. Did you change Logo image but it doesn’t work or did you change this text https://prnt.sc/lFTq4hk8UYYc or what? We need to know it exactly.
Thanks in advance.
Regards