In your sentence you are mixing many expressions together. This isn't always a problem, but in this situation the expression does not follow English conventions or grammar. First of all, a native english speaker would never use the word "we" in that sentence, because you do not know how to speak it. Since you do not know how to speak it yet, you can not be included in knowing how (or being able) to say 'we' say it in english. Understand? Secondly, you are going to have to pick one word to complete how. You cannot use do and can in the same sentence. which word you use depends must correspond with the noun.
Again:
Instead of "how do we can"
the word "do" already signifies ability, so saying is redundant since the phrase "How do we can" is using two words to describe the exact same thing.