As TL-WPS510U works on Ad-hoc mode as default, it doesn’t have DHCP function. When you connect to it, you need configure a static IP for your MAC computer. The default IP address of TL-WPS510U is 192.168.0.10.
Click on APPLE icon，go to System Preferences.
On the new window, please select Network and click it.
On the Network, click Airport on the left side menu. Pull-down Network Name and select WLAN-PS. Then Click Advanced.
On the advanced page, click TCP/IP and select Configure IPv4 as Manually. Type in the IP as 192.168.0.11/255.255.255.0, and click OK button. At last, click Apply button.
Open the Safari and type 192.168.0.10 in the address bar, press enter button. Then, please refer to step 3 on the FAQ 252.