Is that a field you’ve added? if so it may be an issue with your theme maybe? try switching to 2017 and see if you can see it then.
Sorry I do not understand what you mean. In the user profile should appear the biographical information that is added from the admin panel. In the following link you can see my profile that does not appear description
https://agendaholistica.es/miembros/eduardoguerrerogonzalez/
The personal description should be added by users from their buddypress profile. How can it be done?
I’ve tried the Twenty Seventeen theme but no description appears either
I don’t think I can advise you. BuddyPress does not some built in with a personal description. You can add one, in Dashboard>>Users>>Profile Fields, and it would be displayed during signup and in the users Profile>>View page. However, that’s not the default landing page for a profile, so it looks like your theme is overloading the users profile, and I think your theme developers would be best placed to ask.
actually, you can try adding the description page in the place I’ve suggested, it should display for 2017 and maybe your theme.