CHROME PASSCODE VERIFICATION SITUATION

IF A PASSCODE IS POSSIBLE TO CONFIGURE INTO AN OPERATING SYSTEM WITH A RESET TIME PERIOD TO CHANGE, HOW ACCESSABLE AND SECURE SHOULD THE PASSCODE RECOVERY BE IN TERMS OF NAVIGATING STEPS TO OPEN PAGES AND FOLLOW INSTRUCTIONS?
GUESS WHAT?
CHROME SNYC HAS GOT MY COMPUTER TIED UP IN KNOTS ...
...WELL, I COUNT ON MY EMAILL FOR ALOT ON MY COMPUTER; WISE OR NOT, I HAVE A GMAIL .
GMAIL IS A GOOGLE OPERATED EMAIL HOST.
WHEN A CHROME-SYNC PASSCODE NEEDS ATTENTION, EVERY GOOGLE PAGE I HAVE GETS POP UP WINDOW REDIRECTED AUTOMATIC, AND NO CLUE AT ALL WITH INSTRUCTIONS TO 5-7 STEPS TO RESET THIS PASSCODE (this is not the user google password to account, this is a seperate passcode for a CHROME-SYNC.
I AM NOT SURE I HAVE EVER MADE MY FIRST PASSCODE YET, THOUGH MAY HAVE ON PREVIOUS COMPUTERS.
THE IMAGES OF THE ICON DISPLAY I MAY ADD HERE LATER, TOP SHOW
SIDE BY SIDE ,
THE PASSCODE INSTRUCTIONS AND
 ALONG ON THE OTHERSIDE WITH
DISPLAYED DIFFERENCE THAN DESCRIBED INSTRUCTIONS.
WHERE TO GO TO FIND SOLUTION???
... I CHOSE A RANDOM GOOGLE FORUM AND CHOSE A CATEGORY OF ""VERIFICATION" TO START MY EXTENDED SEARCH AFTER NOT FINDING SOLUTION THRU HELP CENTER DESCRIPTIONS.
... NO PROBLEM IF CHROME SYNC IS NOT ON A COMPUTER
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