From your description of the flowers, your plant is probably in the Aroid family. More specifically, I would guess that it is an Aglaonema or perhaps a Dieffenbachia or Spathiphyllum (peace lily). However, the latter typically has leaves that are all the same color.

If you do a Google search under the above names you will find photos that should help you ID your plant. If yours is not any of the above, let me know how yours differs.

Plant tags are notoriously unhelpful. No plant NEEDS low light. Some plants will survive in low light, but all will do better in bright indirect light. Whatever your plant is, it should be close enough to a window to receive good reading light all day long.

It is never a good idea to repot a new plant. This invariably leads to root rot as the soil stays moist for too long. I suggest that you move your plant back into its original pot by removing the soil that you added.

Inadequate light, pots that are too large, and overwatering are the likely reasons that you are struggling with your plants. Caring for plants can be fairly easy once you understand the basics.