Insert Row On A Table In Protected Sheet

I am working on an excel table in my worksheet contains formulas and locked cells. lets say table range is from column "a" to "f" and there is formula on cell in columns "c" and "f". I just locked cells in column "c" and "f" to prevent people changing the formula accidentally. but when the sheet is protected i am not able to insert or delete rows as the rows has locked cells in columns "c" and "f".

I tried the below macro to unlock the sheet, insert row and lock the sheet again:

[Code] .....

So by running the macro it asks the password and do the job but the issue is it needs password and i do not want people to know my password. I don't want them able to unlock the workbook and make any undesired changes. I want them to be allowed insert or delete rows and input data in unlocked cell. I want the sheet to be locked all the time and only when people want to insert or delete a row it be unlocked and be locked again after inserting or deleting whit no need to insert password in this case only.