Regarding the issue of not being able to connect to the wireless network:
Please check the wireless network settings again, making sure that parameters such as SSID and password are entered correctly.
Try using an external wireless antenna or move your device closer to the router to improve the signal.
Update your device's wireless drivers and firmware if possible.
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Regarding the issue of not being able to log in to the NAS:
Double check the account and password to log in to the NAS, make sure they are correct.
Check your account's access settings on your NAS.
View log records on the NAS to find the cause of the error.
I hope these suggestions will help you solve your problems.