Now I understand what you say
You enter UK at LHR, and then connect a flight to Edinburgh
This is not hard if you can use English.
Firstly, you pass the immigration control at LHR airport (given you have all essential visas, travel documents etc)
Then, take a free bus or train to carry you from Terminal 2 to Terminal 5 at LHR airport
Then, wait at Terminal 5 and find the boarding gate for your flight to Edinburgh
Your luggages will be sent to Edinburgh by the airlines, not you.