Food diary headings

Hi, I'm new to MFP, one week in.

Had a bit of a browse at a few food diaries. I noticed that some people have headings such as "post workout snack" and snacks between certain hours. My food diary only has the headings breakfast, lunch, dinner and snacks. Could someone please tell me how I can insert these extra headings so I can more accurately capture when I am having these snacks, as they are all listed in one long list at the end of the diary, under snacks. Thanks, Anita