First enter your bankroll. This is the maximum amount of money you want to wager. It may not be your entire bankroll as you might not be willing to bet the whole lot.
Then put in bet amount and chance.
Chance percentage doesn't actually matter in the long term. If you had unlimited money and could do unlimited bets then whatever chance you set, the payout is balanced to payout at a corresponding rate. Therefore there is no one chance percentage that is the best. The variables you can adjust is 'raise on loss' and 'bet amount' as this determines how many losses you can support. You want to be able to sustain the most amount of losses which depends on your 'bet amount' and 'raise on loss' relative to your 'bankroll'.
The minimum recommended raise on loss is the minimum raise required to recoup all losses on the next bet if its a win. If you select a higher chance to win such as 95%, the min raise will be 3200%. In the example above you can see 49% is 100% raise on loss and raise on loss decreases with less chance to win. Chance only influences your minimum recommended 'raise on loss'. I like 49%, although I agree in a world with unlimited money it doesn't matter, most of us are limited by money so if you do decide to do a few more bets after your set bankroll limit, you wont have massive increases in 'raise on loss' nor will you have a super low chance of winning off the next bet (hopefully that makes sense).
Also, you can set a bet amount of 1 sat and raise on loss of 100% and you may be able to support 100 losses but remember the goal is to mine and most of your bets are going to be at one sat which will take too long to mine anything.
I will leave you with my favorite strategy so far. This offers a good risk/reward ratio for a moderate bankroll.
Set stop loss to 5000 Sats and you will have 10 losses to work with. You will get to 10 losses at some stage even though the chance is 0.097%. After the stop loss triggers, you can then do a few extra rolls in manual mode.
Disclaimer: You will eventually get caught out and probably bet something you don't want to by opening it up to human control. Sometimes its best just to throw away a loss and start again. Note that 142% is above the 104% to recoup losses. This allows you to make money which is good for when you have to cut losses. Hopefully you get back to breakeven.