you just have to put one next to the other. you should be able to place the hi-hat so its pedal is very close to the second bass pedal. the hi-hat will likely end up being farther to the left than it used to be, but that's the price you pay. but seriously, if they are more than a few inches apart, you've probably got something arranged wrong, so try some other arrangement possibilities. you may be able to rotate the pedal around the hi-hat stand to move the legs to accommodate the bass pedal. i've known drummers who had both the hat and the double kick pedal PLUS a remote hat, with a third pedal down there and the actual hats over on the right side of the kit.