If I rem rightly, as I havn't used RR for a long time, when you start RR, you should have on the main screen 2 windows, 1 for trains you have installed, & 1 for routes you have installed. You should also somewhere on the main screen have a link to options or settings. You'll find what you need in there. You should when you download RR & install it, have a help file somewhere in the installed folder, & it'll explain everything in there about setting it up & running it.
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Ok, after having a search, luckily I still have it, albeit havn't used it in a long time. Ok, after selecting your route, & what train to yous, you then should come up with a box, called 'Starting Options'. This is where you basically adjust the settings according to what you want. All I can say is, read the manual, & fiddle with the settings to see what effect they have, it'll just be a case of trial & error Until you get some idea of what the different settings do. Have fun!