How do I....?

I'm new to the site and haven't been able to figure out how to take a food that's in the system and cut it in half.  For example the serving size of dressing is 2 TBS but what if I only use 1, is there a shortcut or do I have to type it out?  Thanks in advance!

When you click a food to add it to your log you have the option to change the serving size or even how you measure it. For example, if the serving size is 1 cup, change it to .5 cup, or change the 2 to a 1 for your salad dressing. Also, instead of the default measurement, which is sometimes completely meaningless (how much is 1/2 filet, for instance?), you can select "other", and then enter ounces or grams.

Thanks  :)