求翻译：用email注册的用户，如果注册后未在有效期内验证邮箱，则无法找回密码。 在使用过程中，用户可以删除单条消息，也可以删除会话。触屏手机上通过长按消息或会话的方式删除，有按键的手机则通过选项按钮找到删除入口。是什么意思？

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Use of registered email users, if not within the validity period after the registration certification mailbox, you will not be able to find password. During the course of their use, the user can delete single message, you can also delete session. touch screen phones through long press news or conver

User registers who with email, after if registers has not confirmed the mailbox in the term of validity, then is unable to retrieve the password. In the use process, the user may delete the single scroll news, also may delete the conversation.Touches on the screen handset through long according to t

Email registered users, if not within its validity period after registration to verify mailbox, you cannot retrieve password. During use, the user can delete a single message, you can also delete the session. Touchscreen phone by means of a long message or session delete on, press the key to mobile

Email registered users, if not within its validity period after registration to verify mailbox, you cannot retrieve password. During use, the user can delete a single message, you can also delete the session. Touchscreen phone by means of a long message or session delete on, press the key to mobile