Setting limits is easy! Simply click your profile in the top right corner, select "Responsible Gaming," then select either "Deposit Limits" or "Spend Limits."
Deposit Limits will allow you to set limits on how much you are allowed to deposit in a period of time - daily, weekly, and/or monthly.
Spend Limits will allow you to set limits on how much you are allowed to spend or wager in a period of time - daily, weekly, and/or monthly.