You have to connect to your sql database through some program. I use HeidiSQL which is free or Navicat.
My serverprovider is Blackbox so there is their instructions:
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To connect to your database.
1. First click the 'Create database user' button on the control panel, this will also give you the username and password to use.
2. Download navicat
http://www.navicat.com/ or heidi sql
http://www.heidisql.com/3. Enter the IP, port and username and password you were given in step 1.
Voila
Write ip adress, user name, password and port.
Then when you are connected click there:
(I use my language but icon should be same
) and then copy to this window all this:
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DELETE forest, forest_patch
FROM forest, forest_patch
WHERE forest.GeoDataID = forest_patch.GeoDataID AND
forest.Quality < 80;
SET @c442 = 1;
SET @c443 = 1;
SET @c444 = 1;
SET @c445 = 1;
SET @c446 = 1;
SET @c447 = 1;
SET @c448 = 1;
SET @c449 = 1;
SET @c450 = 1;
UPDATE forest_patch
SET Version = @c442:=@c442+1
WHERE TerID = 442;
UPDATE forest_patch
SET Version = @c443:=@c443+1
WHERE TerID = 443;
UPDATE forest_patch
SET Version = @c444:=@c444+1
WHERE TerID = 444;
UPDATE forest_patch
SET Version = @c445:=@c445+1
WHERE TerID = 445;
UPDATE forest_patch
SET Version = @c446:=@c446+1
WHERE TerID = 446;
UPDATE forest_patch
SET Version = @c447:=@c447+1
WHERE TerID = 447;
UPDATE forest_patch
SET Version = @c448:=@c448+1
WHERE TerID = 448;
UPDATE forest_patch
SET Version = @c449:=@c449+1
WHERE TerID = 449;
UPDATE forest_patch
SET Version = @c450:=@c450+1
WHERE TerID = 450;
SET @c442 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 442 ORDER BY TerID);
SET @c443 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 443 ORDER BY TerID);
SET @c444 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 444 ORDER BY TerID);
SET @c445 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 445 ORDER BY TerID);
SET @c446 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 446 ORDER BY TerID);
SET @c447 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 447 ORDER BY TerID);
SET @c448 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 448 ORDER BY TerID);
SET @c449 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 449 ORDER BY TerID);
SET @c450 = (SELECT Max(Version) as max FROM forest_patch WHERE TerID = 450 ORDER BY TerID);
UPDATE terrain_blocks
SET ForestVersion = @c442
WHERE ID = 442;
UPDATE terrain_blocks
SET ForestVersion = @c443
WHERE ID = 443;
UPDATE terrain_blocks
SET ForestVersion = @c444
WHERE ID = 444;
UPDATE terrain_blocks
SET ForestVersion = @c445
WHERE ID = 445;
UPDATE terrain_blocks
SET ForestVersion = @c446
WHERE ID = 446;
UPDATE terrain_blocks
SET ForestVersion = @c447
WHERE ID = 447;
UPDATE terrain_blocks
SET ForestVersion = @c448
WHERE ID = 448;
UPDATE terrain_blocks
SET ForestVersion = @c449
WHERE ID = 449;
UPDATE terrain_blocks
SET ForestVersion = @c450
WHERE ID = 450;
And then tap F9 or right mouse button and then choose run.
Don't forget to set lower quality of trees. I used 15 and it remove just fine amount of trees