Due to the way HTML editing technology is built to work in conjunction with web browsers, the font size drop down menu is limited by what the web browsers will translate as the underlying font sizes 1-7.
These underlying HTML font sizes 1-7 are represented in the font size drop down menu. Next to each font size we have shown what each font size translates to in the closest possible pt size.
This means font size 1 is closest to 7.5pt (not 8pt). You can select text and easily change it to this size (1 - 7.5pt), or another size (such as 2 - 10pt).
However in order to change your font to 8pt, you would need to modify the HTML code to specify that size.
Alternatively you may want to contact your administrator and request a change be made to the Template to either change the default size of the text or lock the formatting to a specific size so that it is easier to edit.