your problem is so unclear. you need to use a better English if you want others to understand and help you. you can use the
local board of your language and either get help there or kindly ask someone to translate it to a more fluent English.
~ your first problem may be because you entered an invalid Dogecoin address
~ your second problem is a simple bitcoin confirmation problem. if you include a small fee, it takes a long time to confirm and the site will only credit your account if it has at least 2 confirmation
~ the third thing about maintenance is weird to me too but they go down for it when they add/remove coins to their site.