>>1780603vigorous sprays of soapy water, add neem oil for extra effect or buy ladybugs online and release on the plant to eat the aphids.
i bet they have already spread by how fucking many you got on that one pic.
ps clean that shit off the underside of the leaves, it looks like dirt is splashing up from the top soil on them so be more careful when you are watering. throw some mulch on top of the soil for example to prevent that.