I recently found out my preprint paper (to be published in a journal) that missed a citation of others' work, the paper is just published online in IEEE Xplore? The sentences are rephrased, however, I forgot to give credit notice within the texts. I feel very badly about it. I know this is a plagiarism. I do not want to find the excuse for myself. I want to remedy it before I cannot. What should I do it now?
The paper I should cite is in the reference list of the bibliography. I did not cite it within the texts.