Please $,$ how do I decrypt it manually.

The following ciphertext was encrypted by an affine cipher:

edsgickxhuklzveqzvkxwkzukcvuh

The first two letters of the plaintext are if$.$ Decrypt. $($The ciphertext is stored in the downloadable computer files $($bit$.$ ly$/2$JbcS$6$p$)$ under the name edsg.$)$