How to change theme and looks?

Hi, I have installed OJS on Mamp server, and I can’t figure out where is the management, described in Customization instructions: “User home”> journal manager>…

(Changing Themes
OJS 2.2 comes with a number of themes that you can use. These themes will change the site colours, but will not affect layout. Follow these steps to switch your theme:
• Log in as Journal Manager…)
Are the the instructions only for journals online?
I have CURRENT VERSION: 3.0 ALPHA 1 (MAY 8, 2015 - 12:41 PM) installed

Hi @Laura_Rahinantti,

I would suggest installing OJS 2.4.6 (the current stable release), not OJS 3.0 alpha. The alpha release is for testing purposes only. If you’re curious about OJS 3.0, we’ll be releasing a beta later in August.

Alec Smecher
Public Knowledge Project Team