Walking weight loss help needed

Just started out on a tread mill have bought the heart
monitor 41 years old figured out 179 max heart rate been
doing 15 minutes at 4 kilometers then going to 5 deg on
incline and 5 kilometers for 5 minutes. then 20 minutes at
8 incline with 6 kilometers of speed. at first my heart
rate is at 62 resting up to 93 after first 15 then 115 at 5
kilometer rate then for the next 20 were i push it 8
incline with 6 kilometer my heart goes to 142 to 153. I
have been doing 4 days straight of this then riding my bike
for 4 days to work. my heart rate while riding is from 100
to 126 the ride is 6 kilometers in distance in the morning
then back 6 kilometers at the end of the day. any sugetions
I have stopped for the most part all meats except maybe 4
portions a week of chicken and 1 portion of beef a week. I
have been eating 20 ornges a week and also salad. protien
bars.78 grams with 24grams of protion and 36 of carbs.in
them.about 3 a week. I started out at 269 lbs in feb this
year and early may weight is 232lbs. as of today i am still
around 229-231 lbs. it seems like i have hit a wall on the
weight loss. I can know see some of my abs . when I
calculate my body fat by height and weight it is the number
30 meaning overweight. I have a large framed body 6 feet 2
Any ideas Fawnsaprk