Safari doesn't display the option " add exchange rate " ?????

Thanks for the answer. It still doesn't display on Safari and 

I can't log in on Chrome.

I log in with my Gmail account normally. When I log in on Chrome, it asks me my password after clicking " launch " button for the challenge. I don't have a password. 

I don't know what to do.

( I clicked on ' forgot my password and entered my username , it doesn't work either. )