You can edit your contact details (phone number and email address) in your profile by going to the drop down menu on the right, and selecting 'Edit profile'. In step 3 you will find your contact details.
Here you can modify your contact details and save them accordingly. Please keep in mind to always select your country code in the equally named box, otherwise you won't be able to save the changes. After the changes are made, you will receive notifications regarding new tours etc. via your new email address.