Solved

Blue Button For Bonus?

Despite the fact this won't solve the issue. I hope it can answer the question: "why is the blue button missing?"
Please read carefully: https://igpmanager.com/forum-thread/19760

What is your main issue for the moment? Game money or car parts?
I can tell some game-tips that would help you.

Finance Help
It's very important to have a small budget. YdA (Young Driver Academy) drivers are the best ones, as you can't find such low salaries on transfer market.

Some things that you can do to avoid negative balance:
1- Choose good sponsor, get one that pays 3 tokens and the second one should balance bonus and fixed money;
2- Get the cheapest car supplies;
3- Get rid of extra staff or drivers.```

Being more drastic you could (I hope you won't have to do that):
4- Stop to level up headquarter buildings;
5- Do not renew Doctor's contract if you aren't training drivers;
6- Change to a 1-driver League (That save parts and game money).


Car parts help

Here's something you can do without any performance lose:
1- Do not fix your car for the last race of season, as you'll get a fully fixed one in the next season;

A desperate measure would be:
2- Completely stop fixing one of your cars, it will brake but you'll save car parts and engines.


I'm sure other players have better tips than this. I hope they can also give their opinion here.