Before you back or pledge to a project, make sure you have logged into your account on String Funding.
Click 'Back Now' on project landing page to back the project.
You will be need to select one of the payment methods from the followings:
POLi direct pay,
ETH (Digital Currency) deposit,
and your account balance.
Then you can enter the amount of you pledge and you will be given an estimated number of tokens to be allotted to you. The real allotted amount would be different from this number. It is determined at settlement date.
Confirm the pledge and it is all completed.
You can check your backed projects in Account -> My Projects.