Hello im a bit new with vb programming

i was wondering how i can login to a webpage with a button that has no id just a name

Code:
 <button name="loginBtn" type="submit" class="glue primary">Login</button></p>
        
       <div id="SMSVerifyObj"></div>
  </fieldset>
</form>

<iframe id="loginIframe" name="loginIframe"></iframe>
heres what i have so far it adds my email and name to the webpage just need to make it click the login button on the page

Code:
Form1.WebBrowser1.Document.All("emailSplash").Value = "myemail"
Form1.WebBrowser1.Document.All("passwordSplash").Value = "mypassword"

this the name of the button not working any ideas?
Form1.WebBrowser1.Document.All("loginBtn").submit