If you are trying to get more settlers in Going Medieval, you will have to wait for random in-game events.
In these events, settlers will arrive at your settlement under various circumstances, such as escaping bandit raids or simply showing up.
To have settlers participate in these events, you will need to choose the option that allows them to enter your village and accept them when they show up.
However, you might want to build some defenses in the bandit raid situation, because if you help them, a raid will come in two days.
Related: How to Assign Jobs to Settlers in Going Medieval
In this case, you can build walls in this situation by clicking on the war tab at the bottom right of your screen and equip weapons by clicking on them so that your villagers can defend themselves.
But if you're looking for a faster approach to getting more settlers, there's nothing but events. However, you can get more settlers at the start of a new game by creating your own custom scenario.
That said, by creating a custom scenario, you can get more colonists at the start of the game by increasing the number of colonists as shown below.
Along with getting more settlers, you can also change other options like starting resources, starting season, and other conditions like equipment and settler constraints.
For more on Going Medieval, check out How to Build Underground Storage in Going Medieval.
