You can have up to 6 additional email accounts in Comcast besides your primary account. Sign on to your primary account and click on the Users & Settings tab at the top of the page. You should see a link in blue underneath your user name that says Create Secondary User.
If you notice yellow leaves in other areas of the tomato plant, or the yellowing at the bottom is spreading upward, this could be a sign of disease, such as curly top virus (usually curly top virus will show signs of yellowing leaves that are curling up as well), Ringtop Virus, or other diseases.
But watering leaves in the heat of the day can cause serious fungus problems, such as gray leaf spot (Stemphylium), early blight (Alternaria), and powdery mildew. The photo (above right) is of early blight, a fungal disease caused by too much water. The most important thing in watering tomato plants is consistency.