Forgotten Tales

Não consigo entrar no vulcão, que faço?

Press the weapon button.

Which button?

press on the entrance and it exits on the other side

Have a look at section 3.1, in particular the final section where it mentions the bottom right hand corner.

That is the weapon button.

http://ftmmorpg.dmgamestudio.com/help/#interface_screen

in the offline game, is it different?

Is what different?

if you play with 5 players, to attack you just have to click on the character and everyone will

no buttons in the lower right corner

I had no problem. Just tap right over the entrance, and you should see a green arrow. Sometimes, the characters get in each other's way on narrow paths, so you may have to try several times to get them to all walk there and be close enough.