求救！按助教所說修改終端機指令，結果server無法開啟

mamp安裝完成後，瀏覽器無法解析php文件，只會把整個代碼打印出來。

此後，依助教要求輸入終端機指令，修改apache文件，但終端機的wq保存是怎樣保存？接著輸入指令去重啟apache，是要整個終端機關掉再重開後，去輸入指令重啟嗎？因為在apache文件下，不像是能輸入sudo apachectl restart

然後現在因為有動到終端機，現在重開mamp後，server無法開啟，apache也無法勾選。輸入終端機指令sudo vi /etc/apache2/httpd.conf 就跳錯誤，整個mamp砍掉重灌也沒用

E325: ATTENTION

Found a swap file by the name "/etc/apache2/.httpd.conf.swp"

          owned by: root   dated: Sat Jul  1 11:05:07 2017

         file name: /private/etc/apache2/httpd.conf

          modified: YES

         user name: root   host name: wuzhede-MBP

        process ID: 28776

While opening file "/etc/apache2/httpd.conf"

             dated: Wed Jan 11 21:17:29 2017

(1) Another program may be editing the same file.  If this is the case,

    be careful not to end up with two different instances of the same

    file when making changes.  Quit, or continue with caution.

(2) An edit session for this file crashed.

    If this is the case, use ":recover" or "vim -r /etc/apache2/httpd.conf"

    to recover the changes (see ":help recovery").

    If you did this already, delete the swap file "/etc/apache2/.httpd.conf.swp"

    to avoid this message.

Swap file "/etc/apache2/.httpd.conf.swp" already exists!

[O]pen Read-Only, (E)dit anyway, (R)ecover, (D)elete it, (Q)uit, (A)bort: 

選Ｏ下去查看apache文件
#LoadModule php5_module libexec/apache2/libphp5.so
＃字號依然存在

請求大神支援，環境搭不起來後面的課程都卡住了
然後涉及終端機還有指令麻煩一步一步教啊，小白如我根本不知道終端機的操作。