Send an email...
By sending an email to me@wunderlist.com from the email address you used for your Wunderlist registration, you can create lists and tasks while you're on the go. You can use the subject line of your emails to either add tasks to existing lists or create new ones. If the subject of your email is left empty, tasks will be added to your Wunderlist inbox. To create multiple tasks with one email, simply separate them with a line break by hitting Return/Enter after every task. More than one line break will make Wunderlist ignore the rest of your email, meaning you won't have to remove your signature.
Please note that Wunderlist does not support HTML emails so please make sure your email is plain text.