Can't login to client area for SSl issue

[error 404]

The information you’re about to submit is not secure

Because this form is being submitted using a connection that’s not secure, your information will be visible to others.

https://ibb.co/9pT6QNK
when user trying to login to their account from client area login panel. but the problem is showing that error.
i checked at https://www.whynopadlock.com/ and here is the result.....
A form with the action of "http://example..com/dologin.php" exists in the source code of the tested page.

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This form needs to be updated to use "https://example.com/dologin.php" or another secure URL for your padlock to return.
https://ibb.co/dQnfFpy
How can i solve this error? i am using updated WHMCS!

[error 404]

solved this problem,,,! thanks in advance.. 

i just add https://  at whmcs general settings ! now solved !