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In general, most PLC operating systems run designated programs repeatedly, in a constant "loop" or "scan". You don't have to do jumps or GOTO statements, but rather simply configure the routines to be executed by a repeating operating system task.
What model of Schneider controller are you using ?
My understanding is the SoMachine Basic is essentially a re-skinned version of CoDeSys, so you're going to have Tasks, and you're going to put your ladder logic routine (POU, in CoDeSys terminology) into one of those.
Describe your programming challenge in as much detail as you can, and practice with making screenshots with the Windows Snipping tool, then cropping them and attaching them to your posts as PNG files.