Check the top part of the the post, it is for changing profile fields. The second part is for changing the sign up fields.
But watch out though, on my site I added extra fields to Create Account and Add Person, and one of my users cursed me out and demanded that the sign up process is too hard, so I removed all the extra fields from those two forms except for the recaptcha. I kept the other ones in the Edit Profile area. Then I went into my google repatcha account and changed the security preference to "Easiest for users".
How do I include a row down option that will show different results for example we have Gender >Male > Female, i need to know how to include this for my site. I want something like country> America >Algeria >Belgium.
Please specify - do you have only English language on your site? If yes, plz specify - did you install other then deleted it? Now it looks like you need to click on "English" title in the appeared box and switch to another language to add the System name there too.
You may do it as "recommended" action - create on the Groups home page the new block (visible only for unconfirmed or similar level) with info "Join the group!" then in Studio->Settings->Persons area fill the value of field "URL for 'Custom Page' redirect " as "page.php?i=groups-home"