To edit your development details, click on your profile picture in the top right hand corner and select 'Development settings'. Next, click on your chosen development and then select 'Edit development'. From here you will be able to amend all of your development details.
If you can't edit your development details it may be because your development is 'Online'. In order to make changes to your development details you will need to take your development offline temporarily. To do this click the 'Take offline' button. Once you're done making changes click 'Go live' and then 'Go Live & Publish 'to have your development live and showing on the Yourkeys website.