UI is simple. There are only one button name "connect'.
I need "connect twitter" function In [login to view URL]
It should work like the following.
If you click the connect button you will redirect to twitter.com. Then you will input your username or email and password to login twitter.com.
After authorization success, I need username, userprofile link datas.
It should be in response data.
I need only things like the "connect" twitter on opesea.io.
Here is the documentation. It will be helpful to develope.
[login to view URL]