The only two actions that you can perform to a contract model is Edit and Delete.
First step is to enter in contract model section by clicking Contracts submenu from CRM module then click on Model Contract.
After here, you can Edit a model by clicking on the and then click on the Edit button. Change the infromation accodring to your preferences then click on Save.
For deleting a model, you have to click on then click on Delete button. Click on OK and the model is deleted.