Adjusting Tektro R40 for wider tire

[jjmatt47]

I have Tektro R40 dual pivot caliper brakes (as provided on my 2011 Trek)

Recently I decided to use a slightly wider tire (going from 23 to 25)

When I try to mount the wheel, the gap between the brake pads is not large enough to accommodate the larger tire

I could deflate the tire a bit and get it to slide through, but I would like to adjust the brake to accommodate the wider tire without doing so, so I could remove the front wheel for travelling

I have googled adjusting this brake but am still confused with what has to be done

Can you help ?

THANKS

[Painkiller]

do you know how to use the release lever? that should open up enough to let the tire pass. but the cable should be set with the lever in the closed position to begin with.