Assuming this is RCT2, but I think it's the same case in RCT as well : Each level has one of two financial models
1.) guests pay an entrance fee to get into the park, but then the rides are free.
2.) guests enter the park for free, but then have to pay to go on each ride.

So if you can't change the fee for rides then probably you're on a level where you can only adjust the entrance fee at the main entrance to the park.

A way around this is to use run your gog copy through openrct2 : https://openrct2.org/
It adds widescreen support and a whole bunch of other improvements and optional features. One being the ability to choose the funding model for your park. I also like to always use the model where park guests have to pay to go on each ride.

thank you matewis, understood. well, if i may bother you with one more thing, my game doesnt save automatically when my window accidentally interrupted by other apps. really pissed me off, once i have 10 hours of work and it just lost when my stupid windows prompted me on other stupid shit (man im angry haha).

Glad to help :)
I'm not sure, but I openrct2 may have an autosave setting you can set to what you want. But being interrupted by another app shouldn't crash your game in openrct2 in any case.

Can someone help me debug this issue? It seems to shut down and lose all progress anytime a background update pops up. I also can't seem to find the autosave function - any help much obliged!