In order to view content or perform actions referred to in this article you need to have the appropriate permissions enabled in your security group. Go to System > Setup > Security Groups and access your security group to update your permissions. The relevant security group tab and specific permissions for this article can be found here:
To assign the form templates you wish to appear when you generate and / or email a lead form:
Go to System > Setup > Forms Setup > Lead > Forms.
Select the form templates you wish to assign from the Forms Assigned drop-down list, then click Add Form.
You can then reorder the assigned templates under Manage Forms using the grey drag handles.
This will change the order in which the form templates appear when selecting from the Form drop-down list when generating / emailing a lead form, with the top form being the default option. You can remove a template option by clicking the icon.