Finally managed to overcome this wallet problem. it turns out the dev sends its address via dm in discord instead of here. If you had any trouble,  just contact the dev in discord, he will help us until we succeed. I admit this wallet problem is very confusing, especially for newbie like me. but the dev patiently helped me out there to set up the wallet.

fyi: i pmed dev here for 3 times without know he had already dmed me in discord.