On an Iphone:

• tap on settings
• scroll to the bottom until you see the homesnap app w/ an icon pointing to the right - tap on it
• tap on notifications
• tap on allow notifications

On an Android:

• tap on settings
• tap on notifications
• tap on app notifications
• find Homesnap in the list
• select the option to turn on notifications

(Please note: some older versions of Iphones/Androids may have a different menu setup)