In Luana helps me, Luana does the helping and me receives it. Words like me, you, him and us are object pronouns. In Brazil they normally go before the verb — just like the me and se of eu me levanto:

Subject	Object	Example
eu	me	A Luana me ajuda. — Luana helps me.
você	te	Eu te ajudo. — I'll help you.
ele / ela	o / a	Eu o conheço. — I know him.
nós	nos	O Marcos nos convida. — Marcos invites us.
eles / elas	os / as	Eu as conheço. — I know them.

Some regular verbs to use them with: ajudar (to help), convidar (to invite), entender (to understand), encontrar (to meet; to find), amar (to love), levar (to take) and mostrar (to show).

With two verbs, the pronoun goes between them: Você pode me ajudar? — Can you help me? You've used this one before: Pode me trazer…?