Zoom's scheduling is very basic. There are a number of options.
1. Schedule the 2nd Friday every month as one meeting, then schedule the 4th Friday every month as a second meeting. Each one will have a different meeting ID, but the passcode can be made to be the same.
2. The following is possible but not recommended. Schedule the 2nd Friday every month as one meeting using the personal meeting ID, then schedule the 4th Friday every month as a second meeting using the personal meeting ID and set the passcode to be the same.
3. Create a recurring meeting in the web portal. Set the recurrence for "no fixed time". This allows YOU to start the meeting any time YOU choose. Then send email invitations where you specify the meeting date and time.
4. Create a recurring meeting in the web portal. Set the recurrence for "no fixed time". This allows YOU to start the meeting any time YOU choose. Use an external scheduler such as outlook to send the appropriate invitations.
5. Use an external scheduler to manage the meetings and the invitations.
These are some of many possibilities.