Gimp shows no button to select a different font in the text editing tool:
Everything I saw in tutorials has a little button you click to choose the font style, but I do not see one.
Best Answer
That looks like the pop-up quick toolbar that appears over the selected area. There should be a "Tool Options" tab in one of the floating toolboxes (mine is on the bottom-left side of the screen by default) that has additional options when the Text tool is selected. If it's not there you can add it to a toolbox through the little left-pointing triangle on the tab bar.
I believe that 2.7.3 and later have a Single-Window mode that may solve your issue. I'm not sure how you have GIMP installed on OS X, but you can probably get 2.7.3+ using MacPorts.
Best Answer
That looks like the pop-up quick toolbar that appears over the selected area. There should be a "Tool Options" tab in one of the floating toolboxes (mine is on the bottom-left side of the screen by default) that has additional options when the Text tool is selected. If it's not there you can add it to a toolbox through the little left-pointing triangle on the tab bar.