In SSMS right click the Table and select Design. Change the name and click save. Done!
If you get an error you may have to disable the prevent saving changes that require table re-creation setting. In SSMS select tools - > options, click Designers, uncheck Prevent saving changes that require table re-creation, click OK
I have not used TOAD for this type of management of SQL Server. SSMS is a free application from Microsoft if you want to go that route.
That being said TOAD should have the same type of functionality. Find the table on your Object explorer right click and select ALTER TABLE select Colunms change and click OK.