No. Your login is issued specifically to you. Even if you change firms, your login remains valid.
However, you must update your address, including any changes to your e-mail address, in CM/ECF (see Local Rule 5-4.8.1). For detailed instructions on how to update your contact information in CM/ECF, see the Court’s website at https://www.cacd.uscourts.gov/e-filing/updating-your-contact-information [1]. In addition, if you are counsel of record in any cases currently pending in this district, you must file and serve Form G-06 (“Notice of Change of Attorney Business or Contact Information”) in each of your pending cases. Doing so will satisfy your notice obligation under Local Rule 83-2.4.