It is possible to create a node that repeats. For example, assume a user is required to enter a value. Follow this input node with an IsEmpty action node to determine whether the value is empty. If the value is empty, the input node can be repeated and the user requested to enter the value again. To create such a repeating step, simply direct the user back to the node you want repeated in the logic section as shown below.
If you want to direct the user to the Start of the flow, you can also specify this in the logic section of the node. The below symbol indicates that the user is directed back to the 'Start' node.