The SeoPress plugin will let you do that.
@hiboy,
no need for a plugin to change that.
“admin” is the username who’s added by BP for a profile. So if you want to read Admin Stream Directory, change the username from admin to Admin.
You can also use the localisation file (buddypress.mo) to change the whole text, ie. Activity Stream to Overview or anything else.
https://codex.buddypress.org/developer/customizing/customizing-labels-messages-and-urls/
That said, it’s not a good practice to use such username.
Read here from Matt what he says about: http://ma.tt/2013/04/passwords-and-brute-force/
@chouf1
How about accounting for usernames, first names, surnames across multiple components such as Activity, Profile…? Only a plugin will let you do that, unless you want to write some bulky custom code.
