As a seller you can select which shipping companies you are willing to use to ship out parcels to buyers. This can be done in the profile section of Vechit by going into settings > postage.
Here you can select which postage options you are willing to use to ship parcels out. With Vechit you can use Evri to pick the parcel up from your home address or drop off to a parcel shop. Vechit currently only offer home delivery with Evri, if you needed to the parcel to be delivered to a parcel shop you would need to buy the parcel outside of the app.
Please note, having the parcel picked up from your home address may incur an extra cost than dropping the parcel to a parcel shop.