If you have been lucky to receive an email from MindMyHouse saying that you were successfully chosen for an upcoming house sitting assignment, the next step is to send the home owner a message, indicaating your acceptance. You can do this via your Message centre, or via your 'My assignments' page.
Also, we have the following FAQ to help you finalise the details of your house sitting assignment.
https://www.mindmyhouse.com/support/faq/41
Please also find below a link to our house sitting agreement. Generally, our advice is that you should meet with the home owner first before agreeing to the assignment. During this meeting, you should go through the house sitting agreement with them, so that your (and their) expectations are met and agreed upon.
https://www.mindmyhouse.com/advice/advice_legal
If you are coming from overseas and is unable to meet with them, you can arrange to meet online (eg. Skype) although this may be a bit harder.