If current employees already have lots of other functions within the company, don't throw the SEO duties at them also. This is especially true if they've never done SEO before. If you want someone in your company to learn search engines registration from scratch, then find that one person who is interested in it, and make that be their sole duty within the company. Give them time to read, read, read, and practice, practice, practice. If there is someone who already has some knowledge of SEO and has shown that they can get some results, then they *may* be able to also handle some other functions within the company, but that would depend on how extensive your search engine registration campaign was going to be. (E.g., Do you have a huge site? Do you have zillions of phrases that are appropriate for your site, etc?).