In El Salvador, trademark registration is mandatory to obtain enforceable rights. Prior use of a mark does not by itself grant ownership. If you use a trademark in El Salvador but do not register it, a third party can still file and obtain registration for the same or a very similar mark.
Only in exceptional cases involving well-known or famous trademarks can the true owner act against a filing made by an unrelated party.
To obtain protection, the application must be filed before the Intellectual Property Office of the National Center for Registration CNR.
If you file a combined trademark (word + logo), your exclusive rights will be limited to the exact configuration filed. To protect the word and logo independently, it is advisable to file separate applications for each element.