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Depending on the variety, your lily is likely just getting growing.

Give it more time.
This article has care information.
https://www.gardeningknowhow.com/ornamental/bulbs/lily/potted-tree-lilies.htm

Not sure where you are located or what a lilly pinky tree is, maybe a local name for a plant that we know by another name.

We would need to know what the target pest is or what signs of plant damage you are seeing, in order to help you with pest control options.

The product sold as Confidor contains the active ingredient Imidacloprid, a nicotine chemistry based systemic insecticide. It is effective for control of some insect pests, but not all.

It is used as a foliar spray and can also be applied as a soil drench for root uptake. Any product with that active ingredient may be a substitute, but you would have to know what the target pest is and what type of application and the solution concentration that would best address the infestation, safely and effectively.

If you are looking for a different class of insecticide, because maybe your application of Confidor didn't work, then please ask us again with a little more information so that we can be of better service. Photos are always a big help.

It looks like a Tree Lily! It can be difficult to tell without the flowers on it. This article will help: https://www.gardeningknowhow.com/ornamental/trees/linden/linden-tree-information.htm

The ideal time to divide tree lilies is in fall, but if your friend has already divided them and passed some on to you, I would go ahead and plant them in the ground as soon as possible. You will be tempted to water frequently because it's hot, but remember not to overdo; too much water will rot the bulbs. Also, lily bulbs get nourishment from the leaves; if they had not already withered and turned brown, I would not cut the stem off. Here is more:
https://www.gardeningknowhow.com/ornamental/bulbs/lily/growing-tree-lily-bulbs.htm
https://www.gardeningknowhow.com/ornamental/bulbs/lily/lily-transplanting.htm

They will be left until they are completely dead. Cutting them while they are taking those nutrients back into the roots will be detrimental to the plant's health.

This article will give you more information on the care of these plants: https://www.gardeningknowhow.com/ornamental/bulbs/lily/growing-tree-lily-bulbs.htm

This is, actually, the proper way to propagate the plant! This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/lily/dividing-tree-lily-bulbs.htm