Once you have created a bot, you can activate it and start to trade by adding a subscription to it.
To be able to invest in a strategy, you need to:
1) Connect an exchange (which is supported by the strategy where you want to invest). Learn how to connect an exchange here.
2) Have enough Mizar credits. Learn how to buy Mizar credits here.
By clicking on the "three points" on the right-hand side and choosing "+Add New Subscription", you can activate your bot.
Read this article to learn how to setup your investment.