The number of inputs to the And function block is an extensible parameter. The block default is two inputs. You add inputs by right-clicking the function block diagram, clicking Extensible Parameters, and then modifying the number of inputs. This creates additional input connectors for the block.
The And function block examines the inputs you define and applies the logical AND function to the inputs. When all inputs are True (1), the output is True. When one or more of the inputs is False (0), the output is False.