To convert an e-mail into a task, you need to send it from the registration e-mail (only) at x@leadertask.com The e-mail will appear as a task in the In folder. If the e-mail is in another (not registration) mailbox, you need to forward it to your registration e-mail address and only then — at x@leadertask.com
To do it, you need the synchronization feature, which is available in Premium and Business accounts only and within 14 days since registration as a trial.