Please help password protecting the file having macro already installed

Dear Experts,

Just now I have taken help from Holger for making the VB code for the attached spread sheet. Now, I need to protect both sheets in this file with possword protection.

Can experts please help me? The file is attached. Macro already available is EVENT macro (fyi pls). I tried and failed.

I have already unlocked the cells to be used by the users.

Please help me. My sincere thanks for supporting to provide me this solution.

Thanks and regards,
gm2612

OTD Monitoring parallel.xls