my qui ck employer account have been unable to log me in , meanwhile i need to correct the previous w2 done on it because there are some corrections needed

You will need to amend the W-2 form using these instructions.  It cannot be amended using Quick Employer Forms.

@JotikaT2 if I amend through this instructions. How long for it o be processed after I submit the amendment? 2-3 days? 
and if I submit w2 form now through this process . How long for it to be processed??

Unfortunately, only the filing agencies would be able to answer those questions.  Please refer to the contact information at the bottom of this link to inquire directly with the agency.