Mark .
If you have the Maplin set up then it is easy.
Fist tip tho make sure you put the wing nut in that secures the dish.(lesson learnt )point dish south ,compass on the back of dish is good guide line
Right now you have done that set the arm to near enough vertical.
Set TV to AV channel switch on Sat receiver and press info button (SAt hand set )followed by button 1 you should have a humming noise from your TV gently move you dish one way or the other until you get the tuning bars on screen into the higher figuresw of say 70 the top and in the 60 on the bottom scale and listen the hum from tv change from a humming to high pitched whistle , the clearer the and louder the whistle the better your picture , now secure it all .
Good luck and have fun chaneels come down in no particular order.
Mark if you have any youngsters around while you are searching some adult sites will be seen
.
If you have any problems always glad to help
Must go now Lady Roger awaits
Sir Roger