What's your question? Ask

It might be aphids. If so, this article might help: https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm

If you see something crawling around in the soil, it's probably fungus gnat larvae. This article should help: https://www.gardeningknowhow.com/special/children/fungus-gnats.htm
If it is fungus gnats, one of the most important things to remember, fungus gnats love, love, love wet soil. Let the soil dry some between waterings.

Angel Plants are actually a brand that sells many unusual exotic plants. If you have the name of the specific type of plant, we can better give you advice on the kind of watering it needs. If you can't find the name, you can either send us a picture or describe it, and we should be able to identify it for you. That being said, most of the plants they sell need to be watered when the top of the soil feels dry to the touch. Also make sure that there is good drainage and that the plant is not in standing water.

The Exotic Angel name is a brand name of a greenhouse, Hermann Engelmann Greenhouse Inc.

They grow over 400 varieties of houseplants.

Look for an additional tag that should have come with your plant. It should have the variety of plant you purchased.

It is not uncommon for some flowering plants to have blooms that last just one day.