You need to be in the protected NOP, the one you access with a token.
Go to the IFPUV portlet
Make sure you use the "Propose Routes" tab.
Enter route as described:
(FPL-ARCID-IN
-B737/M-sryw/c
-EGLL1000
-N0450F230 DCT
-EDDF0115 EDDK
-RMK/……. )
(you may have to play with the FL)