Do not resend a 2014 return, either by mail or NetFile.
Wait until your present return is assessed.
Then file a T1-adj. For the changed items. Include copies of all T5 slips being added, and receipts for the additional charitable donations you are claiming.
If you have My Account for CRA you may also use the Change My 2014 Return feature, however wait until you are assessed before you do this.
CRA will process the changes and send you a Notice of Reassessment, together with any addional rebate or request for payment.
