You can see all the e-petitions currently available for signature through the Modern gov website.
When you sign an e-petition you will be asked to provide your name, your postcode and a valid email address. When you have submitted this information you will be sent an email to the email address you have provided. This email will include a link which you must click on to confirm the email address is valid. Once this step is complete your 'signature' will be added to the petition.
People visiting the e-petition will be able to see your name in the list of those who have signed it, but your contact details will not be visible.
Next step: