@Neha_Sharma  I have copied some of the info from that page below, and I hope this info helps...

Getting Started

How do I get started with My Pega?

If you already have an active Pega account, navigate to my.pega.com.

Otherwise, create a free Pega account. 

An active Pega account not only provides you with full access to all of Pega's websites such as Pega Community and Pega Academy, but it also allows you to own your Pega brand and see how well prepared your Organization is to implement Pega projects.

My Organization

What if I am not seeing my organization’s data? 

Ensure your organization’s email address is set as your primary email address. You may check this by navigating to My Settings in the top right menu next to your profile picture.

If your organization’s email is listed, but not your primary, mark it as primary using the 3-dot menu next to the email address.

If you don’t see your organization’s email in the list of “Other Email Addresses” (associated with this account)”, then click on the “Add Email Address” and follow the instructions. 

Please be sure to verify your new email when you get the verification email and sign out and back in again for the changes to take effect.

If you’re still having issues, please get in touch and we will assist. https://community.pega.com/pega-community-feedback?action=provide_feedback_on_my_pega

Please Note: Drill-down access control is limited to Administrators of an organization. Client and Partner members should connect with their Client Success Manager or their Partner Enablement Representative respectively, for approval and access. If you are unsure of who your organization’s contact is, please send email request to [email protected] and we will assist.

also

My Account FAQs How do I reset my password? Manage my email address? Unlock my account?

Visit our Account FAQs for assistance with your account. https://community.pega.com/account-faqs