Re-Activating yahoo Account is more easy then Deactivating (Deleting)
Please follow the instructions here to initiate the Re-Activate your account.Step 1. click on this link Click Here
Step 2. Type the email id you want to re-active and also the code shown in the box and then click next
(Note. If you cant see the Code or the form is not working properly change to other browser for example internet explorer, Firefox, chrome or any other if every thing is OK then just follow then steps )
Step 3. Now click on Re-Active Button
Step 4. Success you are done Welcome back to your yahoo id
Deleting yahoo Account