Hi Philip,
You should not risk more than 3% of your account balance. So for example, if you choose robots with 1% risk then you should not trade more than three robots. If you decide to trade 4 robots then you should adjust the lot size to reduce risk. As an alternative you could download robots with low risk. In this case you could trade as many as 6 robots which would result in an account risk of 3%.
Alan,