Diana 3.5 BAB question

When imputing BAB number,the sheet always calculates high BAB,so my question is how can I make it so it can calculate medium or low BAB classes?I suppose that it can be modified by macros but I don't understand them and I don't want to learn them. Me and my group are not using macros and never will,it's just too complicated,and there are a few players who never played D&D before,and macros and other stuff will only make it worse for everyone in the group.

Probably something found in a "settings"-tab or similar. I'm positive that's something customizable on the that sheet.

It doesn't calculate BAB.  You have to enter that manually.  It just displays BAB; BAB-5; BAB-10; and BAB-15 for easy use in macros.  Also for determining when you get a 2nd attack as per: Base Attack Bonus A base attack bonus is an attack roll bonus derived from character class and level or creature type and Hit Dice (or combinations thereof). Base attack bonuses increase at different rates for different character classes and creature types. A second attack is gained when a base attack bonus reaches +6, a third with a base attack bonus of +11 or higher, and a fourth with a base attack bonus of +16 or higher. Base attack bonuses gained from different sources, such as when a character is a multiclass character, stack. You will have to update the BAB manually as per the progression path the individual class uses (High/Medium/Low).

Thanks for the answer,I just realized that it was my mistake,I was actually confused by the fact that sheet automatically updated other bonus attacks and that I couldn't change them but only the first base BAB column. I feel so stupid now...