Thanks! One more question, where I can manage settings of installed addons (for example embed videos)?

It's already fixed, but how can I edit contect of e-mails? I want to translate it.

@martin Okay, thanks for support! I will contact them!  

@martin There is information: WordPress Email sending function wp_mail() doesn't work!  

@alvina How can I hide user groups, or what are they for? Can newly registered user choose one of the groups by himself?  

@sofyThanks for helping, it's working very well! I wanted to ask you how can I set custom avatar for all new users?  

@alvina Okay, e-mail sent!  

@alvina Okay how can I do it? 😛  

@alvina Thank you for fast support! Since website is hidden for now, can I send you access somewhere in private?