In this tab, the right pane displays the description, fields and custom properties associated with the release:
You can edit the various fields (name, description, etc.) and custom properties. Once you are satisfied with them, simply click either the <Save> or <Save and New> button at the top of the page to commit the changes.
When you make changes to the release/iteration’s start-date, end-date, number of project personnel resources, or number of non-working person days, the system will automatically calculate how many hours of effort (planned effort) are available in the release/iteration for assigning tasks. As you begin assigning tasks – either through the Tasks tab or the Iteration Planning screen – the total estimated effort of the tasks is subtracted from this planned effort to give the “available effort”.