If unsure about ie or ei, when the audio of your vowel is as in brief /i:/, we spell it ie; but once the letter c, we spell it ei: … " "To" is the form you employ for a preposition right before a noun, which include "Visit the retailer" https://dharmendra-sir-spelling-m77632.win-blog.com/7850616/an-unbiased-view-of-spelling-rules-in-english