In Google Chrome, when I type something to an textbox, such as my email address or an username for a website, Chrome remembers it. The next time I log in to that website, I just type some first letter and a drop-down menu appears let me choose the data i want to type. But sometimes It doesn't work. How can I add a text I want for Chrome auto complete it. Funny, I know to remove an entry, just choose it and press "del"; but don't know how to add. Thanks for your help.
You can do it by creating address profile.
Go to google chrome settings ---> (scroll down) Show Advanced Settings ----> (scroll down) Under Passwords And Forms click Manage Auto Fill Settings ----> Add New Street Address ----> Enter required fields ----> Done :)
Also you can create multiple address profiles too. The profile details will fill out automatically in almost forms.
[ Ensure the Enable Autofill to fill out web forms in a single click is ticked ]