html template HTML registration via whmcs

[Xperikss1]

Hi,

How do I make a registration in html (php) sending a request to WHMCS?

Example:

 <form action="{$systemsslurl}dologin.php?goto=clientarea.php" method="post" name="frmlogin">
   <label>Email address</label>
   <input type="email" name="username" placeholder="Your Email">
   <label>Password</label>
   <input type="password" name="password">
   <button type="submit">Login</button>
 </form>
 <a href="/pwreset.php" >Forgotten your Password? Click Here</a>

But how do I implement this for registration?

is it possible to do this?