And another issue to this part.
I got
<label for="wlpeRegisterEmail">
<input type="text" id="wlpeRegisterEmail" name="email" value="[+post.email+]" /> Adres e-mail
</label>
<br />
<label for="wlpeRegisterFullName">
<input type="text" id="wlpeRegisterFullName" name="fullname" value="[+post.fullname+]" /> Imię i nazwisko
</label>
<br />
<label for="wlpeRegisterUserName">
<input type="hidden" id="wlpeRegisterUserName" name="username" value="[+post.email+]" />
</label>
When user press button to register he gets error, that username he entered is already in use. Whoah, just because with the first Register press the value of "username" is empty

After seeing error when he press Register once again he registers just fine, because username got finally it’s value. How can I make this work without double pressing Register?
How can I make value of username would be filled with [+post.email+] on first Register press?
What I say might be confusing but I can’t put it in more clear thought right now
Be grateful for help,
Regards,
Mike