Выполните:
1) Установить плагин user-custom-link-v001.xml с помощью вкладки Утилиты -> Управления плагинами -> Добавить плагин. Файл выполнит установку данного плагина.
2) внести изменения в файл .htaccess
Найти:
RewriteRule ^user/([^/]*)/rss.xml$ index.php?mod=rss&subaction=allnews&user=$1 [L]
RewriteRule ^user/([^/]*)(/?)+$ index.php?subaction=userinfo&user=$1 [L]
RewriteRule ^user/([^/]*)/page/([0-9]+)(/?)+$ index.php?subaction=userinfo&user=$1&cstart=$2 [L]
RewriteRule ^user/([^/]*)/news(/?)+$ index.php?subaction=allnews&user=$1 [L]
RewriteRule ^user/([^/]*)/news/page/([0-9]+)(/?)+$ index.php?subaction=allnews&user=$1&cstart=$2 [L]
RewriteRule ^user/([^/]*)/news/rss.xml(/?)+$ index.php?mod=rss&subaction=allnews&user=$1 [L]
Заменить на:
RewriteRule ^@([^/]*)/rss.xml$ index.php?mod=rss&subaction=allnews&user=$1 [L]
RewriteRule ^@([^/]*)(/?)+$ index.php?subaction=userinfo&user=$1 [L]
RewriteRule ^@([^/]*)/page/([0-9]+)(/?)+$ index.php?subaction=userinfo&user=$1&cstart=$2 [L]
RewriteRule ^@([^/]*)/news(/?)+$ index.php?subaction=allnews&user=$1 [L]
RewriteRule ^@([^/]*)/news/page/([0-9]+)(/?)+$ index.php?subaction=allnews&user=$1&cstart=$2 [L]
RewriteRule ^@([^/]*)/news/rss.xml(/?)+$ index.php?mod=rss&subaction=allnews&user=$1 [L]
RewriteRule ^user/([^/]*)/news/rss.xml(/?)+$ index.php?mod=rss&subaction=allnews&user=$1 [L]
3) Готово